Why are my rendered images blurry?
Your render looks blurry because of the low samples in the render tab. As you can see in the picture you have 2 sliders, one that says preview : That's the one you use if you go to render mode. And the other slider that says render. That is if you use a camera and render it from there by clicking on the render button above the sampling. I but the render slider way down just to show you the difference.

Now because I use a camera to render this monkey I set the render slider higher to get less noise (blurriness)

Hope this helps.